Previously: Dr. Heller found out Creepy Dave was in a band with Mike, so Creepy Dave killed him. Lynette was broke, because people do without pizza in a bad economy so Scavo's was not doing well. Carlos told Gaby he got his bonus, and she was thrilled. Susan got a job working at MJ's school.
Mary Alice tells us it's not hard to spot a mother who works outside of her home, because there are signs: Lynette dresses in a hurry, a couple other no-names eat breakfast in a hurry and apply makeup in the car. Susan has a sick child. I had no idea that having a sick child was a sign that you worked outside of the home. Mary Alice teaches me so much. Susan shows up at Mike's with MJ and a stuffed monkey. Mike greets them warmly, but then Susan says MJ's sick and she's late, so he has to watch MJ today. He has to work too, but she says she wins because it's her first day. Mike has to deal with Miss Nelson's septic tank at 9, but Susan points out he's a plumber so no one expects him to be on time. Susan lectures Mike about how she went back to work, so now it's time he does his part (because working all day and all night is not doing his part, apparently; now he must also do that and have time to babysit). Mike says he'll reschedule Miss Nelson, so Susan leaves. MJ's sad that she'd leave him while he's sick, but she promises to be back at 6. Mary Alice finishes that it's not hard to spot a woman who works outside the home: Just look for a woman who leaves her house (or, in this case, her husband's house across the street) looking guilty.
Mary Alice is still talking -- now about how exhausted people start coming home from work just after sundown. Some are met by pets. Some are welcomed with martinis. Others are greeted with dinner on the table. (We don't get faces with any of these.) Then there are those who return from a long day to discover unpleasant surprises. With this, we see Susan walk up to her (or Mike's? I can't tell) door, where there's a note that says, "MJ is at my house. Katherine." How extremely unpleasant that Susan now has to walk all the way to Katherine's to pick up MJ. When she gets there, Katherine invites her in warmly, but Susan is cold, cold, cold. MJ says hi to her, but then says he's feeling better because Katherine made him soup, read him a story, and showed him to play blackjack. He tells her he'll always double down on a pair of aces. Susan asks where Mike is, and Katherine explains that Miss Nelson had a plumbing emergency. Susan's all, "Uh-huh," and then tries to drag MJ out, but he runs back to give Katherine a big hug and tell her thank you. Susan tells him to stop, because he's making Katherine feel uncomfortable. Oh, speak for yourself, Susan!